private void Form1_Load(object sender, EventArgs e) {     …       // Récupération du service ISelectionService     System.ComponentModel.Design.ISelectionService selectionService =          (System.ComponentModel.Design.ISelectionService)      designer.GetService(typeof(System.ComponentModel.Design.ISelectionService));       // Add the evenement SelectionChanged     selectionService.SelectionChanged += new EventHandler(selectionService_SelectionChanged);       // Assocation the control container to the propertyGrid     propertyGrid1.SelectedObject = host.RootComponent; }   void selectionService_SelectionChanged(object sender, EventArgs e) {     System.ComponentModel.Design.ISelectionService selectionService = (System.ComponentModel.Design.ISelectionService)sender;       // Creation of the list of controls sélectionned     IComponent[] listSelection = new IComponent[selectionService.SelectionCount];     selectionService.GetSelectedComponents().CopyTo(listSelection, 0);       // Association the controls selected to the propertyGrid     propertyGrid1.SelectedObjects = listSelection; }   // Release the ressources private void Form1_FormClosing(object sender, FormClosingEventArgs e) {     // Release the evenements on the service of IComponentChangeService    System.ComponentModel.Design.ISelectionService selectionService =          (System.ComponentModel.Design.ISelectionService) designer.GetService(typeof(System.ComponentModel.Design.ISelectionService));         selectionService.SelectionChanged -= new EventHandler(selectionService_SelectionChanged);       // Delete the view of designer of panel     panel1.Controls.Remove((Control)designer.View);       // Release the designer to the form     designer.Dispose(); }

We will use the ISelectionService service for associated the selections with the propertyGrid. 

To compile and launch the project and here what you obtain:

You can select the components (also multiple selection) like modifying their properties in the propertyGrid.